S9 S11 1mva power 63kv oil immersed transformer power electrical distribution transformer China suppliers

1.General

66kV low-loss series transformer is our independently developed new generation of transformers on the basis of absorption of domestic and foreign advanced technology, which features low local discharge, low loss, low noise, high reliability, strong protection against abrupt short circuit. Its excellent performance has been recognized by wide users and highly appraised by experts. The full-sealed suspending-cover free products sell well nationwide.

Amount of local discharge: The apparent discharge amount under 1.5 times of rated voltage is less than 80pC.

Noise : Products of 63MVA and below is lower than 85dB(AN)

Power loss: No-load loss is 30% lower than that of IEC standard.

Reliability: All in-service products have no damages or oil leakage occurred

Short circuit withstanding: Model SFZ11-50000/132 smoothly passed the short-circuit withstanding test of the national transformer quality supervision and inspection center and also passed Holland “KEMA” quality Control systom.

2.Coil

The high-voltage coil adopts an interleaved-continuous structure to improve the voltage characteristics under impact voltage and make voltage evenly distributed. All stays and pads are chamfered to keep highly reliable insulation. In the transformer winding there is a zigzag oil guide structure so as to fully cool all areas inside the winding, lower the temperature rise of the winding and the hot point of the winding and prolong the service life of insulation. The HV and MV regulation system are independently provided with voltage-regulating winding to balance the ampere turn of each winding, effectively lower the axial electrodynamic force generated at short-circuit of transformer and improve abrupt short-circuit withstanding capacity.

3.Core

The core is made of high-permeable grain-orientated top quality cold-rolled silicon sheet and the material is cut with advanced Germany GmbH automatic shear line with the cut burrs controlled within 0.02mm. The silicon sheet fabrication adopts “no-upper yoke-lapped” technology and all lapped joints of the silicon sheet are 45° full-miters. The laminated core sheets are integrally pressed and adhered with epoxy resin to make the three-leg two-yoke core a strong and flat integral one with good verticality precision, this effectively improves no-load performance and reduces noise.

· Service conditions

1. The maximum ambient air temperature shall not exceed 40 ℃, and the minimum shall not below - 25 ℃;

2. The altitude shall not exceed 1000m. If special customized transformers and low-voltage components are used, the altitude can reach 4000m;

3. The vertical inclination is no more than 5 °, and no violent vibration and impact;

4. The air humidity is not more than 90% (+ 25 ℃);

5. No gas and conductive dust that will seriously affect the insulation of transformer, no explosion hazard and corrosion of electrical components;

6. Outdoor wind speed shall not exceed 35m / s.

If service conditions beyond the above, specially customized product is available

Note: Due to continuous product improvement, the dimensions provided in this sample are for reference only. If necessary, our company can design and produce according to user requirements. Please contact the company in time.

· Order instructions:

1. The customer needs provide main parameters of the transformer (input and output voltage, capacity, loss, etc.)

2. Other customer requirements